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Old 07-23-20, 08:35 AM   #178
randen
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Join Date: Apr 2011
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NiHoaMike

The purpose of using PWM was to vary the speed of the pump to the heat load needing to be dissipated while prolonging the life of the little motor. As the thermistors temp was up and down so went the motors RPM.

Im just guessing, but I'm sure the motor was stopped but the low PWM caused a little squealing noise that was extremely irritating during the nite.

The snap switch is a simple device and should last a long time at the required current draw. The pump motor is near silent at the rated voltage and the intermitted duty will extend the life without the noise.!! Win-Win

Randen

Last edited by randen; 07-23-20 at 09:29 AM..
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